Perforated-tape-controlled printing apparatus



March 17, 1925. 1,529,873

F. G. CREED PERFORATED TAPE CONTROLLED PRINTING APPARATUS Filed May 10, 1922 9 Shggts-Sheet 1 March 17, 1925. 1,529,873

F. G. CREED PERFORATED TAPE CONTROLLED PRINTING APPARATUS Filed May 10, 1922 9 Sfieets-Sheet 2 March 17, 1925. 1,525,873

F. G. CREED PERFORATED TAPE CONTROLLED PRINTING APPARATUS Filed May 10, 1922. 9 Sheets-Sheet s March 17, 1925. 1,529,873

F. G. CREED PERFORATED TAPE CG'NTROLLED PRINTING APPARATUS Filed May 10, 1922 9 Sheets-Sheet 4 March 17, 1925. 1,529,373

F. G. CREED PERFORATED TAPE CONTROLLED PRINTING APPARATUS Filed May 10, 1922 9 Sheets Sheei 5 March 17, 1925.

F. G. CREED PEHFORATED TAPE vCONTROLLED PRINTING APPARATUS Filed May 10, 1922 9 Sheets-Sheet 6 March 17, 1925. 1,529,873

F'. G. CREED PERFORATED TAPE CONTROLLED PRINTING APPARATUS Filed May 10, 1922 9 Sheets-Sheet '7 F. G. CREED fERFQRATED TAPE CONTROLLED PRINTING APPARATUS Filed May 10, 1922 9 Sheets-Sheet 8 fwd/41%. 6114/ March 17, 1925.

F. G. CREED PERFORATED TAlfE CONTROLLED PRINTING APPARATUS q! Filed May .10, 1922 l 9 Sheets-Sheet 9 Patented Mar. 17 1925 UNITED STATES FREDERICK GEORGE CREED, OF CROYDON, ENGLAND.

PERFORATED-TAPIll-CONTROLLED PRINTING APPARATUS.

Application filed May 10,

To all whom it may concern:

Be it known that I, FREDERICK GEORGE CREED, a subject of the King of Great Britain and Ireland, residing at Croydon, in the county of Surrey, England, have invented Improvements in or Relating to Perforated Tape Controlled Printing Apparatus, of which the following is a specification.

This invention has reference to apparatus of the kind whereby telegraphic or other messages of intelligence in the form of perforations in a tape can be reproduced in the form of ordinary. printed characters on a tape or sheet of paper, the perforated tape being automatically moved forward, in an intermittent manner, by feeding mechanism to an extent dependent upon the length of each letter or other character or space (hereinafter included in the term letter) to be reproduced, whether the lengths of successive letters be variable or not.

Examples of apparatus of the kind referred to are described in the specifications of former British Letters Patent No. 22653 of 1902, No. 25861 of 1905, No. 8999 of 1907 and No. 1947 of 1908.

The present invention has for its object further to simplify and cheapen the construction and improve the working apparatus of the kind referred to and particularly the tape feeding mechanism and the selecting mechanism used respectively for controlling the extent of movement of the feeding mechanism at each operation of the machine, according to the length of the successive letters represented by the perforations in a tape, and for actuating or controlling the resetting means used for resetting air valves, combs or other devices employed for bringing about, under the control of the said tape, the operation of printing mechanism or other mechanism, for instance type setting mechanism, associated with the said tape feeding and selecting mechanism. It also has for its object to provide a simple and compact combined arrangement of tape feeding mechanism, selecting mechanism, comb resetting mechanism and printing mechanism for reproducing in ordinary printed characters, letters represented by perforations in a tape.

For these purposes the tape feeding mechanism, the selecting mechanism and the resetting mechanism are constructed and arranged as will now be described with the aid 1922. Serial No. 559,928.

of the accompanying illustrative drawings wherein Figs. 1, 2 and 3 show respectively in front elevation, side elevation and plan, one construction of perforated tape controlled printing apparatus embodying the present invention. Fig. 4c is a longitudinal vertical section on the lines IV-IV of Fig. 1. Fig. 5 shows in elevation, parts of the apparatus as seen from the rear end of the apparatus and Fig. 6 is a corresponding plan view of such parts. Figs. 7 and 8 are respectively front and rear elevations of parts of the apparatus, Fig. 9 is a detail view showing in face view, one of the combs used in the apparatus. Fig. 10 is a diagrammatic perspective view of the apparatus.

The tape feeding mechanism comprises a pair of perforated plates a and 6 arranged preferably horizontally, as in the example shown, at a short distance apart to form part of a horizontal tape guideway c a tape feed wheel (1 arranged above but extending through the upper plate and into the guideway and carried by a spindle e mounted in stationary bearings f and provided with a toothed wheel g, a horizontally arranged feed rack h arranged to reciprocate below and to gear with the toothed wheel 9 during the forward or feed stroke and from which it is disengaged by a downward movement, practically in the plane of the toothed wheel and rack, preparatory to its backward and selective stroke and held out of gear during such stroke, means for moving the said rack from and towards the periphery of the wheel g, and a spring blade 0 connected to the rack and mounted to turn in one direction upon a horizontal shaft 0 under the action of a spring 5 and to be moved in the opposite direction by a lever arm on the shaft 1' under the action of a cam u fixed on the cam shaft m arranged below and, it may be, as shown, to one side of the tape guideway 0, the several parts being mounted in or carried by suitable stationary parts or bearings 0 supported by the base plate to of the apparatus.

The movement of the rack h into and out of engagement with the toothed wheel 9 may be effected by mounting the rack to slide lengthways in a carrier 2' supported in apivoted frame 2' and adapted to be raised and lowered at the required times, by a cam j on the cam shaft m acting for instance through lever and link mechanism 12, n independent of the spring blade 0 used to reciprocate the rack.

The plates at and b are formed with corresponding transversely arranged pairs of holes of which those in the top plate a are shown at a in Fig. 3.

The selecting mechanism associated with the feeding mechanism comprises a number of pairs of selector plates 1, 1 the plates of each pair being in a vertical plane transverse to the tape guideway with the several pairs of selector plates in adjacent vertical planes, the upper ends of each pair of plates being provided with a pair of pins 2, 2 that extend into the holes in the lower perforated plate Z) corresponding to the holes a in the top plate a of the tape guideway. Associated with each pair of selector plates is a stop lever 3, 3 connected to a spring 4 that acts normally to hold the arm 3 of the lever in the path of the feed rack 72.. and to hold the other arm 3" of the lever downward against an abutment or lug 5 or 5* on one side of each of the selector plates 1, 1 of the pair. The arrangement is such that when either of selector plates is lifted and its pin 2 or 2 is allowed to pass through a perforation in a perforated tape 6 extending through the tape guideway and corresponding hole a in the top plate a of the guideway, the stop lever 3, 3 will be moved out of the path of the feed rack 72 but if both pins 2 and 2 of the pair are prevented from rising, owing to their abutting against a double blank portion of tape at the end of a letter in the tape, the stop lever will not be raised and will then act to limit the motion of the feed rack, under the action of the spring blade 0, in a manner analogous to the stop levers described in the said former British specifications No. 25861 of 1905, No. 8999 of 1907 and No. 1947 of 1908 and for a like purpose. Each of the selector plates 1, 1 is connected to the lower end of a coiled lifting spring 7 or 7 the upper end of which is connected to a fixed part of the apparatus. The selector plates are normally held in the lower and inoperative position by a plate returning bar 8 carried by the bifurcated arm 9 of a two armed lever 9, 9 pivoted at 9 and the other arm 9 of which is arranged to be operated by a cam 10 011 the cam shaft m through a roller 9. The returning bar 8 may conveniently extend through juxta posed notches 1 1 formed in the lower ends of each pair of selector plates. The lifting springs 7, 7 connected to the selector plates tend to lift these plates when permitted to do so by the returning bar 9 and bifurcated lever arm 9 carrying it.

The arrangement is such that for each rotation of the cam shaft m, the returning bar 8 is permitted to rise to permit the selector plates 1, 1 to be raised by their springs 7, 7

so as to cause such of their pins 2 or 2 as are opposite holes in a perforated tape 6 in the guideway to pass through the said holes and thus enable the corresponding selector plates to lift the corresponding stop levers 3, 3 out of the path of the feed rack 71,. This rack is simultaneously disengaged from the toothed wheel 9, connected to the feed wheel cl, by the link of, lever n and cam and then permitted to be moved backward by its spring blade 0' until arrested by that stop lever 3, 3 that is associated with the pair of selector plates whose pins abut against a double blank portion of tape at the end of a letter and which lever is consequently not raised. After this action has taken place, the returning bar 8 is moved downward by its cam operated lever 9, 9 to draw down all the selector plates 1, 1 against the action of their springs 7, 7 and the feed rack it is simultaneously re-engaged with the said toothed Wheel 9 and is then moved back to its original position by its spring blade 0 which is turned in the opposite or forward direction and into its initial position, against the action of its spring s, by the lever arm 2f on the shaft 7 upon which the blade is mounted and which is then actuated by the associated cam u on the cam shaft m. The rack it in thus moving back to its original position, turns the toothed wheel 9 and consequently the feed wheel cl through the number of teeth or spaces corresponding to the length along the tape 6 of the letter therein being dealt With.

The resetting mechanism operated from the selecting mechanism and acting to reset combs 11, 11, or equivalent devices, (hereinafter referred to as combs) controlling the printing mechanism, comprises pairs of resetting levers 12, 12 of which there is one pair for each pair of selector plates 1, 1 and under the control thereof. For this purpose, one of the resettin levers, say 12, of each pair thereof may be arranged to slide between two lugs 13, 13 on one side of one of the selector plates, namely 1, of the corresponding pair of selector plates, and the other resetting lever 12 of the pair being similarly arranged to slide between two lugs 14, 11 on the other selector plate of the pair. The said lugs 13, 13 and 14, 1-1 are, as shown, arranged at different levels as also are the ends of the resetting levers engaging there with. The stop levers 3 and resetting levers 12, 12 are, as shown, arranged above and transversely to the cam shaft 121. The resetting levers 12, 12 are mounted in a carrier 15, for instance in the form of a. lever pivoted at 15*, whereby they can be moved towards and from projecting arm 11", 11 on the combs 11, 11 respectively, once for each rotation of the machine by a cam 15* on the cam shaft against which the carrier is held by a spring 15 The free end of each of these levers is normally held in such a position (see Fig. 4:) that it will not operate the corresponding comb 11 or 11 of a pair of combs when moved towards the same, but will be moved into a position to do so upon its other end being raised by the corresponding selector plate 1 or 1' and the carrier 15 being moved towards the comb.

As there are as many pairs of resetting levers 12, 12 as there are vertical pairs of selecting plates 1, 1 in the selecting mechanism, there are as many pairs of notched combs 11, 11 in the printing portion of the apparatus as there are pairs of resetting levers. This arrangement is adopted owing to the fact that selector plates 1, 1 other than those corresponding to the set of perforations in a tape representing a letter to be translated into a printed character, are able to rise, when permitted to do so by the returning bar 8, and cause their pins 2 and 2 to enter the perforations in the tape corresponding to a letter behind the one being dealt with. In order therefor that the resetting levers corresponding to the selector plates that are not concerned in the letter to be reproduced shall not affect the proper resetting of the combs to enable the proper selector bar or lever 16 of the printing mechanism to come into the operative position at the right time, each comb 11 or 11 is suitably notched (see Fig. 5) to admit of such bar or lever entering the notches in the set of combs corresponding to the required letter notwithstanding that the remaining combs will not be actually concerned in the reproduction of the letter. For this purpose the pair of combs 11, 11 corresponding to the double blank space at the end of a letter are allowed to remain unmoved in their neutral position whilst all projections between notches on the other combs beyond that point that could prevent the selector bar or lever falling into the aligned notches corresponding to the letter, whether such combs should happen to be in their neutral or operative position are removed. The combinations of notches in this case are distinguished by the fact that along the line of any particular selector bar or lever 16 corresponding to particular letter, all the combs representing perforations in that letter will be moved into their operative position, and all the other combs within the letter, including the double blank space, atthe end of the letter, will remain neutral, and the notches for the selector bar or lever are cut in that position. The notches in the other combs beyond the particular letter are so cut. as for instance to extend in both directions, that they will be inoperative on the selector bar or lever 16 no matter whether the combs are moved or not by the selector plates 1, 1 outside the combination of the letter.

For dealing with Morse telegraphic tape, there will be ten parallel pairs of holes in the two perforated plates a, Z) forming part of the tape guideway, ten pairs of selecto! plates 1, 1 with ten pairs of pins 2, 2 thereon, ten stop levers 3, 23, ten pairs 0t resetting levers 12, 12 and ten pairs of combs 11, 11 or equivalent devices.

Tape feeding, selecting and resetting mechanism constructed substantially as hereinbefore described can be combined with printing mechanism of various kinds. It may however advantageously be continued with printing mechanism of the kind described in the specification of my application for Letters Patent Serial No. 401,991. wherein a printing wheel is arranged to be rotated by friction from a second rotary shaft and to be arrested in the correct printing position by spring actuated selector bars or levers the movement of each of which into an operative position is controlled by a set of annular notched combs the relative positions of which are controlled by resetting means under the control of selecting mechanism associated with the tape feeding mechanism of the apparatus and with a cam shaft, the second rotary shaft being arranged to be driven at a greater speed than the said cam shaft, say at a speed of from about 30% to greater.

In such a combined arrangement, according to the present invention, and as shown in the accompanying drawings, the secondary shaft 17 used for driving the printing wheel 18 through a friction device is arranged parallel to the cam shaft m of the tape feeding and selecting mechanism hereinbefore described and mounted in bear ngs 20 carried, it may be, and as shown, by the same base plate 10 as is used to carry the cam shaft and associated parts. The rosetting levers 12, 12 associated with such mechanism are arranged at their free ends, when lowered by the act-ion of the selector plates 1, 1*, to engage projecting arms 11'. 11 on the annular notched combs 11, 11" forming part of the selector arrangement of the printing mechanism, so that they can be used directly to partly rotate such combs against the action of returning springs to reset them at each operation of the apparatus in accordance with the vertical movements of the said selector plates of the main selecting mechanism under the control of perforated tape as hereinbefore described. The comb arms 11, 11 are normally held by their springs 22 against a stationary support.

The two: parallel shafts m and 17 of the apparatus may be driven at the required different speeds by spur wheels 23 and 2% respectively from a spur wheel 25 arranged between them and driven from a. main driving shaft' or spindle. The endw ays movable sleeve 26 for moving the selector bars or levers 16 of the printing mechanism out of the notches of the notched combs may be actuated at the required times by the bifurcated arm 27 of alever 2728 mounted to turn about a vertical axis at 29 and the other arm 28 of which is arranged to be actuated by a cam 30 on the cam shaft. The striker 31 for actuating each type lever or carrier on the printing wheel 18, when brought into the correct printing position by reason of the correct selector bar or lever 16 having been brought into the path of a radial arm 32 attached to the printing wheel, is or may be actuated by a lever 33 carried at one end of a spindle 34 that is mounted in a stationary bearing and is provided at its other end with another arm 36 engaging another cam 37 on the cam shaft m whereby the striker will be operated at the required times. The striker carrying lever arm 33 may be actuated from a lever 38, fixed on the said spindle 34, through a headed pin or stub screw 39, that is fixed to it and extends through the lever 38, and a coiled spring 40 surrounding the pin and bearing against the head thereof and against the said lever 38. The platen 41 for supporting the paper strip or tape 41 upon which letters are to be printed by the type levers, may, as in the example shown, be a roller mounted to turn about a vertical pin 42 carried by a standard 43 on the base plate 10, as in the construction of printing apparatus described in the specification of the said former application, Serial No. 401991. The paper strip 41 may be drawn between such roller and a feed roller 44 that is pressed against it by a spring 45 and is carried by a vertical spin dle 46 to which an intermittent rotary motion is imparted by a ratchet wheel 47 fixed thereto and engaged by a spring pawl 48 on a lever 49 rocked by a link 50 deriving its motion from a crank pin 52 on the corresponding end of the cam shaft m, a detentbeing provided to prevent backward rotation of the ratchet wheel.

An inking roller 54 carried by a vertical sup ort 55 such {is an adjustable spring bla e, fixed to the said standard 43, serves to ink the type characters on the printing wheel.

As will be obvious, the several parts of the apparatus embodying the present invention can be variously modified in construc tion and arrangementto suit requirement and without departing from the essential features of the invention. Thus, although it is preferred to arrange the tape guideway horizontally and to arrange associated parts to suit, it could be arranged otherwise, for instance vertically, the position of other parts being correspondingly modified.

What I claim is 1. In perforated tape controlled apparatus of the type herein referred to, a guideway for perforated tape, printing mechanism adapted to be controlled by a perforated tape in said guideway, a tape feed wheel arranged to engage a perforated tape extending through said guideway, a toothed wheel connected to said feed wheel, an endways movable rack, a frame in which said rack can reciprocate, means for moving said rack backwards and forwards in said frame and means for moving said rack out of engagement with said toothed wheel before making its backward stroke and into gear with said toothed wheel before making its forward stroke.

2. In perforated tape controlled apparatus of the type herein referred to, a tape feed wheel, a toothed wheel connected to said feed wheel, an endways movable rack, a frame in which said rack can reciprocate, means for moving said rack backwards and forwards in said frame, means for limiting the backward movement of said rack to an extent corresponding to the length of the perforated letter in the tape to be moved forward J at each feeding operation and means for moving said rack out of engagement with said toothed wheel before making its back ward stroke and into gear with said toothed wheel before making its forward stroke.

3. In perforated tape controlled apparatus of the type herein referred to, tape feeding mechanisms comprising a pair of plates forming a guideway for perforated tape and having a series of transversely arranged pairs of holes therein, afeed wheel having teeth extending through one of said plates and adapted to engage feed holes in said tape, a toothed wheel connected to said feed wheel, a rack adapted to rotate said toothed wheel, means for moving said rack into and out of engagement with said toothed wheel at the required times, means for moving said rack backwards and forwards, a series of pairs of selector plates arranged in parallel planes, each pair having pins adapted to enter a corresponding transverse pair of holes in one of said perforated plates and corresponding holes in the tape to be fed forward, each selector plate having a lateral projection, means tending to move said selector plates separately towards said perforated plates, a corresponding series of spring controlled stop levers each having an arm arranged in the path of the projections on the corresponding pair of selector plates and an arm normally in the path of said rack to arrest backward movement thereof but adapted to be moved out of said path when either of the selector plates of the corresponding pair thereof moves forward to enable its pin to enter a perforation in said tape and means for releasing said selector plates and afterwards returning them to normal position.

4:. In perforated tape controlled apparatus of the type herein referred to, tape feeding mechanism comprising a pair of plates forming a guideway for perforated tape and having a number of transversely arranged pairs of holes therein, a feed wheel having teeth extending through one of said plates and adapted to engage feed holes in said tape, a toothed Wheel connected to said feed wheel, a pivoted frame, a rack mounted to reciprocate in said frame, means for tilting said frame to move said rack into and out of engagement with said toothed wheel, means for reciprocating said rack in said frame, means for moving said rack out of engagement with said toothed wheel before making its backward stroke and into gear with said toothed wheel before making its forward stroke.

In perforated tape controlled apparatus of the type herein referred to, tape feeding mechanism comprising a pair of horizontal plates forming a guideway for perforated tape and having a series of transversely arranged pairs of holes therein, a feed wheel having teeth extending through one of said plates and adapted to engage feed holes in a perforated tape in said guideway, a toothed wheel connected to said feed wheel, a frame mounted to turn about a horizontal axis, a rack mounted to reciprocate in said frame, means comprising a cam for rocking said frame and moving said rack into and out of engagement with said toothed wheel, a spring blade connected to said rack, a spring normally tending to move said blade and rack in a backward direction, a lever adapted to move said blade and rack in a forward direction against the action of said spring, a cam for oscillating said lever, a series of parallel pairs of vertical selector plates arranged in parallel planes, each pair having pins at its upper ends adapted to enter a corresponding transverse pair of holes in one of said perforated plates and corresponding holes in the tape to be fed forward, each selector plate having a lateral projection, a spring tending to move each selector plate upwards, a corresponding series of spring controlled stop levers each having an arm arranged in the path of the projections on the corresponding pair of selector plates and an arm normally in the path of said rack to arrest backward movement thereof but adapted to be moved out of. said path when either of the selector plates of the corresponding pair of selector plates rises, a lever for normally holdmg said selector plates in their lower position and to release them and permit them to rise, a cam for operating the last mentioned lever and a rotary shaft on which the several cams are so mounted as to enable them to act at the required times on the parts they control.

6. In perforated tape controlled printing apparatus of the kind herein referred to, the combination with tape feeding mechanism, printing mechanism embodying a printing device, a series of selector bars each of which is adapted to arrest said printing device in position to enable a corresponding character to be printed and aseries of combs for controlling the selector bars, of selecting and comb resetting mechanism comprising a series of parallel pairs of selector plates under the control of perforated tape the letters in which are to be reproduced as ordinary printed characters, means for enabling the selector plates to move into their operative positions when perforations in the tape or brought opposite to them corresponding pairs of comb resetting levers, each resetting lever being adapted to be moved into operative position by movement of the corresponding selector plate into operative position, means for causing those resetting levers that have been moved into their operative positions to adjust the corresponding combs and bring about a resetting of the several combs and permit the selector bar corresponding to that letter in the tape that is to be reproduced as a printing character to move into its operative position to arrest the printing device, means for returning displaced selector plates to their inoperative positions and means for returning the resetting levers to their inoperative position away from the combs.

7 In tape controlled printing apparatus of the kind herein referred to, the combination with tape feeding mechanism comprising a perforated tape guideway, printing mechanism, and a plurality of co-acting combs and selector bars for controlling said printing mechanism, of selecting and combresetting mechanism comprising a number of pairs of selector plates adapted when released, to move toward said perforated guideway and into operative positions controlled by perforated tape in said guideway, means for releasing said selector plates and for afterwards returning them to their inoperative positions, a corresponding number of pairs of resetting levers, each lever being adapted to be moved into its operative and inoperative positions by movement of its corresponding selector plate into the operative and inoperative position, means for moving said resetting levers towards the combs and thereby to set the combs to correspond to a letter in the perforated tape in said guideway and permit the corresponding selector bar to move into its operative position and co-act with the printing mechanism to enable the letter to be printed as an ordinary character and means for afterwards moving said resetting levers away from the combs.

8. In tape controlled printing apparatus of the kind herein referred to, the combination with tape feeding mechanism comprising a perforated guideway for perforated tape, and printing mechanism of a number of pairs of selector plates arranged in parallel planes and adapted, when released, to move towards said guideway, means for releasing said selector plates to permit them to move into their operative position, under control of perforated tape in said guideway, and for afterwards returning displaced selector plates to their inoperative position, a corresponding number of pairs of resetting levers, each lever of each pair being engaged with the one of the selector plates of the corresponding pair of selector plates, a corresponding number of pairs of rotary combs each comb having an abutment device thereon, a series of selector bars arranged around the combs and each corresponding to one of the letters to be printed, and adapted, when moved into its operative position, to control the printing mechanism, a movable holder on which the said resetting levers are pivoted and means for moving the said holder and levers towards the comb abutments so that those levers that have been moved into the operative positions by operative selector plates will partly turn the corresponding combs and set the combs so that the corresponding selector bar can move into its operative posi tion and enable the printing mechanism to print the corresponding letter.

9. In perforated tape controlled printing apparatus, tape feeding mechanism comprising a horizontally arranged perforated guideway for perforated tape, a feed wheel adapted to engage a perforated tape in said guideway and means for intermittently rotating said feed wheel to feed tape successively through distances corresponding to the lengths of successive letters in said tape, a cam cont-rolling the operation of said feeding mechanism, a series of vertical pairs of selector plates arranged in parallel planes below said perforated tape guideway, each plate having at its upper end a pin adapted to pass through a corresponding hole in the guideway and engage a perforated tape in said guideway, springs adapted to lift each selector plate separately, a returning bar adapted alternately to depress and release the pairs of selector bars, a cam for operating said returning bar, a rotary shaft carrying said cams, a second rotary shaft arranged parallel to the said cam shaft, printing mechanism comprising a rotary printing wheel arranged co-aXial with the second shaft and provided with a radial arm, a friction clutch between said second shaft and printing wheel, means for rotating said second shaft at a higher speed than the first shaft, a stationary cylindrical support through which the second shaft extends, a series of pairs of circular combs mounted on said support and corresponding in number to the pairs of selector plates, each comb having an arm extending therefrom, an abutment for said arms, springs for holding said arms normally against said abutment, a series of spring controlled pivoted selector bars arranged around said combs, each corresponding to a letter to be printed and adapt ed when moved into its operative position to arrest said printing wheel in correct position for printing the corresponding letter, each of said selector bars having an inwardly extending radial arm, a lever adapted to act against the several radial arms and move the selector bars away from said combs, a cam on the cam shaft for operating said lever, a series of pairs of resetting levers corresponding in number to the pairs of selector plates, each resetting lever having one end engaged with one of said selector plates soas to be raised and lowered by movement thereof and its other end arranged in proximity to the arm extending from the corresponding comb, a vertical lever upon which the said resetting levers are pivoted, a cam on the cam shaft for rocking said lever to move the resetting levers towards and from the arms on said combs, means for operating said printing wheel to print and a cam on said 'cam shaft for operating the last mentioned means.

10. Tape controlled printing apparatus according to claim 7, wherein the notches in the respective combs are of such length and so arranged that each time the combs are reset to correspond to a letter in the perforated tape, the set of combs will present an aligned set of notches opposite the selector bar corresponding to the letter to be printed and permit said select-or bar to more into its operative position notwithstanding that some of the combs, although moved, are not actually concerned in the reproduction of the letter about to be printed.

Signed at London, England, this twenty seventh day of April 1922.

FREDERICK GEORGE CREED. 

